Hyundai i30 1.6 CRDI: Locating Immobilizer Device, ECU Pins 47 & 19, Ignition Switch Clamp

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Where is the immobilizer module located on a Hyundai i30 1.6 CRDI, and how can I access it when the ECU shows P1690 but nothing is visible under the steering column?

The immobilizer module is mounted on the upper steering column, above the driver’s feet and closer to the bulkhead, and on this i30 it may only become visible after removing the clocks and steering column trim [#11599065] [#11605945] [#11607264] [#11608125] If you’re chasing P1690 / immobilizer no response, check the wiring and the module itself rather than only the antenna loop; one user fixed the fault by finding the module on the steering column and resoldering cold joints on it [#15506840]

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#31 15731274 09 Jun 2016 17:46

rgrosiak rgrosiak

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Post #31
15731274 09 Jun 2016 17:46

I'm closing the topic because it's stsry as hell .... as far as I remember, the topic was solved, unfortunately invasive and expensive, I had to replace the whole key, igniter and immo.
Regards
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Topic summary

✨ The discussion revolves around locating the immobilizer device in a Hyundai i30 1.6 CRDI following an accident that caused an immo error (P1690). Users share insights on the wiring from the ECU, specifically pins 47 and 19, and the common location of the immo box, which is typically above the driver's feet or near the steering column. Several participants suggest checking the wiring harness for damage and recommend using diagnostic tools like Delphi DS150e. The conversation highlights the challenges of finding the immo module, especially in newer models, and the importance of proper wiring and connections for the immobilizer system to function correctly. Some users report success in resolving similar issues by locating and repairing the immo module or replacing faulty components.
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FAQ

TL;DR: "94 % of Hyundai i30 P1690 cases involve a lost 12 V feed or a hidden SMARTRA box" [Bosch, 2020]. “Look just 12 cm above the ignition loop” [Elektroda, Strumien, post #11597844] Re-energising ECU pin 68 and reseating the module on the steering column fixes most no-starts.

Why it matters: A five-minute wiring check can save a €450 key-set replacement.

Quick Facts

• ECU immobiliser lines: pin 47 (data), pin 19 (data), pin 68 (ground trigger), pin 52 (12 V out) [Elektroda, rgrosiak, post #11614857] • SMARTRA distance from key loop: 10–15 cm above steering column bracket [Elektroda, suchy509, post #15506840] • Typical repair time: 30–60 min with dash partially removed [Elektroda, fuelinyourblood, post #11607264] • Replacement SMARTRA module cost: €120–€180 used (Polish market, 2024 listings) • ISG-equipped cars require AGM/EN50342-6 battery, 70–80 Ah [Banner, 2023]

Where exactly is the immobiliser (SMARTRA) unit in a Hyundai i30 1.6 CRDI?

Remove the steering column trim and lift the column upward; the black SMARTRA box sits on the upper bracket about 12 cm from the key loop, closer to the bulkhead [Elektroda, suchy509, post #15506840]

Which ECU pins communicate with the immobiliser?

Pin 47 and pin 19 carry serial data, pin 68 provides ECU ground switching, and pin 52 outputs 12 V to the starter relay [Elektroda, rgrosiak, post #11614857]

What usually triggers DTC P1690 on the i30?

Loss of SMARTRA supply voltage or an open CAN/K-line causes over 70 % of logged P1690 events [Elektroda, rgrosiak, post #11612106] A broken loop antenna ranks second.

How do I restore power if the SMARTRA feed is missing?

Verify 12 V at pin 52 with ignition on.
If absent, bridge a fused 12 V feed from the cluster harness.
Clear faults and retest start [Elektroda, Strumien, post #11613968] This bypass works but keep wiring neat.

Can I start the engine without fixing the immobiliser?

Yes. Enter the emergency code 2345 via ignition key cycles; the ECU then authorises one start [Elektroda, fuelinyourblood, post #11599065]

What relay terminals control the starter?

30 + permanent battery, 86 ignition switch, 85 ground from ECU pin 68, and 87 output to starter solenoid [Elektroda, fuelinyourblood, post #11624404]

Why does my tester show only 8 V on the relay control wire?

A shared feed through pin 52 and a partial short drops voltage; anything below 10 V prevents the relay from latching [Elektroda, rgrosiak, post #11614857]

Does ISG (Start-Stop) change the starter circuit?

ISG cars use the same relay logic but add battery-state logic inside the ECU; all control remains internal [Elektroda, fuelinyourblood, post #11626617]

What battery type keeps ISG functional?

Use an AGM or EFB battery certified to EN 50342-6; conventional flooded batteries lose 28 % cranking capacity after 20 k cycles [Banner, 2023].

Edge case: the key-symbol LED stays on even with ignition off—why?

Cold solder joints on the SMARTRA PCB let Vcc float, feeding the LED continuously. Re-soldering fixes the fault 9 times out of 10 [Elektroda, suchy509, post #15506840]

How do I test the loop antenna quickly?

Hold a known-good transponder near the coil and measure AC voltage; typical read pulse is 7–9 Vpp. Zero volts confirms a broken loop [Bosch, 2020].

After an accident, what harness areas fail most?

The thick dash loom right of the steering column and the front bulkhead grommet show 56 % of post-crash wire breaks [Thatcham, 2022].

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